Top 10 Interior Design Companies in the USA 2026

When most people hear “interior design,” they think of one person with Pinterest boards and fabric samples. That may be true at the small end of the American market, but it could not be further from the truth at the top end.

Some of the largest interior design firms have thousands of employees. They handle corporate campuses for household names, hospital buildings, airports and luxury suites in sports arenas, and the leading firms bill hundreds of millions of dollars a year in fees from interiors work alone.

According to Interior Design magazine’s 2026 Top 100 Giants report, released on March 16, 2026, the top 100 firms took in $6.38 billion in interior design fees in 2025, up 1% from the previous year.

That report is our source for this ranking. We list the 10 highest-ranked firms headquartered in the United States by their 2025 interior design fees (in US dollars), as reported by Interior Design. Firms based outside the US, such as Canada’s Stantec, are not included. Below, we break down the top 10 interior design companies in the USA for 2026: what they do, how big they are and some notable news from 2025 and 2026.

Also Read: Top 10 Real Estate Companies in USA

Why Businesses Hire Large Interior Design Firms in the USA

If you are designing an apartment, you will likely want a smaller studio. When you need to outfit an entire office tower or hospital, it is a different story.

Scale and Delivery Across Many Sites

Your company may have several offices that all need the same design standard. A firm with locations across the country, and often around the world, can handle that kind of job without handing the work to a new team in each city.

Research That Shapes the Space

The largest firms also run their own research. Gensler’s Global Workplace Survey 2026 drew responses from more than 16,400 office workers in 16 countries and found that they spend 55% of a typical workweek in the office. Information like this helps clients figure out how much space they need and how to use it.

Specialist Knowledge by Sector

Different sectors require different knowledge. Healthcare, aviation, data centers, hospitality and sports each come with their own codes, workflows and users. Interior Design’s 2026 report showed that fees from data center work rose 23% in 2025 and cultural and sports work rose 25%, while corporate office work made up about 24% of fees, down from roughly 40% before the pandemic.

Architecture and Interiors Under One Roof

Most of the firms listed here also offer architecture, planning and engineering, which means fewer hand-offs between consultants on big renovations and adaptive reuse projects.

Top 10 Interior Design Companies in the USA at a Glance

Top 10 Interior Design Companies in the USA (2026)

Below are the top interior design companies in the USA, ranked by their 2025 interior design fees.

1. Gensler

Gensler was founded in San Francisco in 1965 by M. Arthur Gensler Jr., Drue Gensler and James Follett, and the firm still calls San Francisco home. Gensler says it has 6,000 professionals who work with clients in more than 100 countries every year. Jordan Goldstein and Elizabeth Brink serve as co-CEOs.

Gensler held the No. 1 spot on Interior Design’s 2026 Top 100 Giants list with $969.7 million in 2025 interior design fees. That is more than two and a half times the No. 2 firm. The research it conducts on how offices are really used helps it serve its clients; its March 2026 Global Workplace Survey found that 30% of workers are heavy “AI Power Users.” Notable projects include Shanghai Tower and 160 Water Street in Manhattan, an office building converted to residential use.

Key Interior Design Solutions
✔ Corporate workplace and headquarters interiors
✔ Office-to-residential and adaptive reuse
✔ Workplace strategy and research
✔ Hospitality, retail and mixed-use design

Best for: Large companies that need one design partner across many cities and countries.

2. Perkins&Will

Perkins&Will was founded in Chicago in 1935 by Lawrence Perkins and Philip Will Jr., who met while studying architecture at Cornell University. The firm currently has more than 2,700 professionals across 30-plus studios around the world. Phil Harrison serves as CEO and chairman, and Perkins&Will has been part of the Dar group since 1986.

It climbed from No. 3 to No. 2 on the 2026 Giants list, with $365.3 million in 2025 interior design fees. Its portfolio runs from offices and hospitals to universities and civic buildings; Halifax Central Library in Nova Scotia and Bridgestone Tower in Nashville are just a couple of examples.

Key Interior Design Solutions
✔ Workplace interiors
✔ Healthcare and science interiors
✔ Higher education and K-12
✔ Civic and cultural spaces

Best for: Institutions and corporates that want design-led interiors backed by a large global network.

3. Jacobs

Jacobs is a Dallas-based company that focuses on engineering and consulting. Even so, it does enough buildings and interiors work to place No. 3 on the 2026 Giants list, with $345.4 million in 2025 interior design fees. Jacobs reported $12.0 billion in revenue for fiscal 2025, which ended September 26, 2025.

The company keeps getting bigger. In its fiscal third-quarter 2026 results, released August 4, 2026, Jacobs reported a backlog of $28.9 billion as of June 26, 2026, and a workforce of almost 47,000 people. Bob Pragada is chair and CEO. If your project involves a complex space such as a lab, data center or government facility, Jacobs can deliver the interiors as part of the wider program.

Key Interior Design Solutions
✔ Interiors for advanced manufacturing and labs
✔ Data center and mission-critical facilities
✔ Government and defense buildings
✔ Integrated design and engineering

Best for: Complex, highly technical facilities where interiors and engineering must be planned together.

4. AECOM

AECOM is a Fortune 500 infrastructure consulting firm formed in 1990. It is now headquartered in Dallas, having announced a move from Los Angeles in 2021. AECOM reported $16.1 billion in revenue for fiscal 2025, which ended September 30, 2025, and a record backlog of $24.8 billion at the end of that year. Troy Rudd is chairman and CEO.

Interiors make up a small part of AECOM’s business, yet the firm ranked No. 4 on the 2026 Giants list with $264.0 million in 2025 interior design fees. If your project calls for interiors delivered within a much larger building or infrastructure program, AECOM can do that.

Key Interior Design Solutions
✔ Interiors for transit hubs and public buildings
✔ Campus and government workplace design
✔ Program management for large capital projects
✔ Combined architecture and engineering services

Best for: Public agencies and large owners running multi-year capital programs.

5. HDR

HDR was founded in Omaha, Nebraska, in 1917 as the Henningson Engineering Company, and it is still based in Omaha today. HDR is 100% employee-owned and has more than 14,000 employees. It reported $3.7 billion in 2025 design revenue, up from $3.4 billion in 2024. John Henderson is CEO.

HDR made the biggest jump among the leading firms on the 2026 Giants list, climbing from No. 8 to No. 5 with $256.4 million in 2025 interior design fees, about $85 million more than the previous year. Healthcare is one area where HDR excels, and in November 2025 it promoted Amy Mays to director of interiors for its health design practice. In October 2025, HDR also became the fifth-largest employee-owned company in the US, according to the National Center for Employee Ownership.

Key Interior Design Solutions
✔ Hospital and clinic interiors
✔ Science and research facilities
✔ Civic and justice buildings
✔ Workplace and education interiors

Best for: Health systems and public clients that want interiors and engineering from one firm.

6. HKS

HKS got its start in Dallas in 1939 under Harwood K. Smith. Today it has about 1,800 architects, designers, planners and advisors in 28 locations, and it generated $732.6 million in global revenue in 2025. Heath May became chairman and CEO in January 2026, taking over from Dan Noble.

HKS is No. 6 on the 2026 Giants list, with $226.7 million in 2025 interior design fees. You will see its work in big venues such as SoFi Stadium and AT&T Stadium, but it does plenty of hospital and hotel work too. HKS also says Fast Company named it the most innovative architecture firm of 2026.

Key Interior Design Solutions
✔ Healthcare and senior living interiors
✔ Hospitality and resort design
✔ Sports and entertainment venues
✔ Workplace and mixed-use projects

Best for: Hospitals, hotels and venue owners planning large, guest-facing spaces.

7. HOK

HOK got its start in St. Louis in 1955, founded by George Hellmuth, Gyo Obata and George Kassabaum. It currently has about 1,800 people in 28 offices spread across three continents, and Interiors is one of its main disciplines. Eli Hoisington and Susan Klumpp Williams have served as co-CEOs since 2023.

HOK is No. 7 on the 2026 Giants list, with $199.8 million in 2025 interior design fees. In April 2026, it acquired ROSSETTI, a Detroit firm known for sports venues, to grow its sports, recreation and entertainment practice. HOK completed KPMG’s New York headquarters in 2025, and Mercedes-Benz Stadium in Atlanta is in its portfolio as well.

Key Interior Design Solutions
✔ Corporate headquarters interiors
✔ Sports and entertainment venues
✔ Aviation and transportation
✔ Sustainable materials programs for interiors

Best for: Corporate and venue clients that want a design-focused firm with deep sports experience.

8. Corgan

Corgan was started in Dallas in 1938 by Jack Corgan. It is an employee-owned firm and, as of August 2026, says it has more than 1,400 team members in 23 locations. Scott Ruch serves as CEO.

Corgan is No. 8 on the 2026 Giants list, bringing in $190.5 million in 2025 interior design fees, and it has been buying other firms. It acquired New York’s Cooper Robertson in November 2025 and Albany-based WCGS Architects in August 2026. You will find Corgan on projects such as JFK Terminal 6, DFW Terminal D and Toyota’s North American headquarters, and its data center practice is growing.

Key Interior Design Solutions
✔ Airport and aviation interiors
✔ Data center and mission-critical design
✔ Corporate workplace interiors
✔ Education and healthcare

Best for: Aviation, data center and corporate clients that want a fast-growing, employee-owned firm.

9. CannonDesign

CannonDesign is headquartered in New York and has nearly 1,600 designers, consultants, experience strategists and technology leaders, who call their approach “Living-Centered Design.” It is also an employee-owned firm, with Brad Lukanic as CEO.

CannonDesign ranks No. 9 among US-based firms on the 2026 Giants list, with $160.0 million in 2025 interior design fees. On April 21, 2026, it announced that Ennead Architects would join the firm. Ennead is a 160-person New York practice that also has teams in Los Angeles and Shanghai. According to Bisnow, it was CannonDesign’s largest deal to date and its seventh acquisition since the start of 2024.

Key Interior Design Solutions
✔ Healthcare and science interiors
✔ Higher education and research
✔ Civic and cultural projects
✔ Strategy and advisory services

Best for: Universities, health systems and cultural clients that want strategy and design together.

10. IA

IA has been designing interiors since 1984 and is based in San Francisco. Long known as IA Interior Architects, it dropped “Interior Architects” from its name in October 2026 and debuted a new logo and website. It is employee-owned through an ESOP, with Tom Powers and David Bourke leading the company.

IA ranks No. 10 among US-based firms on the 2026 Giants list, with $158.4 million in 2025 interior design fees. While most firms on this list are known for buildings, IA built its brand around interiors, and corporate workplaces remain its core. It has also branched into hospitality, retail, aviation, healthcare and advanced manufacturing, as well as base-building architecture, sustainability and strategy.

Key Interior Design Solutions
✔ Corporate workplace interiors
✔ Workplace strategy
✔ Hospitality and retail interiors
✔ Aviation and healthcare interiors

Best for: Companies that want an interiors-first firm for offices and workplace moves.

How to Choose the Right Interior Design Partner in the USA

There is more to consider than size when choosing between interior design companies in the USA. Here are some things to check before you hire.

Match the Firm to Your Sector

Ask for three or four examples of completed work in your industry and at a similar size. A firm that excels at stadiums may not be the best option for a 40-person office.

Check Licensing and Credentials

Rules vary by state. CIDQ, which runs the NCIDQ exam, says 29 states plus Washington, D.C. and Puerto Rico have laws regulating interior design. In July 2026, Missouri began letting NCIDQ-certified designers sign and seal their own drawings. Know who on the team holds the required license or certification where your project is.

Meet the Actual Team

Bigger firms have bigger pools of talent, but your project will be run by a handful of people. Meet your project lead and designer before you commit, and agree on who stays on the job.

Understand the Fee Structure

Ask whether fees are hourly, fixed or a percentage of construction cost, and what triggers additional charges. Make sure the scope of furniture, fixtures and equipment (FF&E) work is in the contract.

Look at Ownership and Stability

Many of these firms are employee-owned, and several have been buying smaller practices. Find out whether a firm has recently made an acquisition and how that will affect your local office and team.

Frequently Asked Questions About Interior Design Companies in the USA

Which is the largest interior design company in the USA?

Based on interior design fees, it is Gensler. The firm took in $969.7 million in 2025 interior design fees, which put it at No. 1 on Interior Design magazine’s 2026 Top 100 Giants list.

How was this list ranked?

We used the 2025 interior design fees from Interior Design magazine’s 2026 Top 100 Giants report and kept only firms headquartered in the United States. The fees cover the 12 months ended December 31, 2025.

Do these firms design private homes?

Most of these companies focus on commercial and institutional projects such as offices, hospitals, airports, hotels, schools and venues. If you are looking for help with a home, a local studio that specializes in residential work is usually a better fit.

Is there one best interior design company for everyone?

No. It depends on your project, sector, budget, location and timeline. A smaller specialist can beat a giant on a focused project.

Conclusion

Interior design companies in the USA have grown into big, multi-disciplinary businesses. Gensler leads by a wide margin, HDR is climbing fast and Corgan is expanding through acquisitions. Deals such as HOK and ROSSETTI or CannonDesign and Ennead show that the industry is still consolidating.

Use this list as a starting point. Shortlist two or three firms with strong work in your sector, meet the people who will run your project, and compare scope and fees side by side before you choose.

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